Needle roller bearings NK, NKS, RNA4900 (NK10/16, NK20/20, RNA4904 and more): Fw, OD, width, r min + 14 ring-envelope STEP/STL files

sizes

99 in table

Notes

• NK, NKS and RNA bearings are machined-ring needle roller bearings without an inner ring: the needles run directly on a hardened shaft (or on an IR / LRT inner ring). Fw is the diameter of the circle inscribed to the needles, so the shaft or inner ring raceway must be Fw (tolerance F6-type fit, see the maker's catalogue). NK has a plain outer ring, NKS a wider-OD (heavier) ring, RNA49 and RNA69 the 49 and 69 dimension series (RNA69 is the wide one). With the matching inner ring they become NKI / NA.
• Numbers: Koyo (JTEKT) machined-ring needle roller catalogue pages (Fw, D, C, r min). Independent check on Fw, D and C: Emerson Bearing's NK list (every one of the 25 rows read matches a Koyo row) and RNA 4900 list (the ten rows that Koyo also has agree, except RNA4906). Disagreements kept: RNA4906 is 18 mm wide in Koyo and 17 mm in Emerson; the four smallest rows NK5/10, NK5/12, NK6/10, NK6/12 have r min 0.2 in Koyo and 0.15 in Nose Seiko (JNS) (no file is made for them). Emerson's page lists NK5/10 under the name NK 5/12 TN (its C is 10).
• RNA4907 to RNA4922 are Emerson-only rows (Fw, D, C, no r min); NK / NKS rows above NK40 were not read. The mid-size 'A' versions are the current ones; the Koyo table names are given as printed (A, TN and other suffixes only differ in cage or tolerance details that are not in this table).
• Files: 14 ring envelopes with r min from Koyo (NK8/12, NK10/16TN, NK12/16, NK15/16A, NK20/20A, NK25/20A, NK30/30A, RNA4900, RNA4902, RNA4904, RNA4905, RNA6905A, NKS25A, RNA49/32): one solid ring, bore Fw, OD D, width C, corners rounded at r min. No needles, cage, oil hole or groove.
• Left out: load ratings and speeds (the makers differ), NKI / NA with-inner-ring types (see the IR page for the rings), RNA48 and RNA59, NQ series, sizes above 40 mm shaft with r min, drawn-cup HK / BK (separate page).

Needle roller bearings NK, NKS, RNA4900 (NK10/16, NK20/20, RNA4904… size chart

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Free files

★ Free files 14 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

Plain text: sheet.txt · JSON: /api/geometry?object=needle-roller-bearings-nk-rna-nks

Fits with

Free

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